{"product_id":"the-source-flo-a-b","title":"The Source Flo A\u0026B – Bloom Nutrients for Plants","description":"\u003ch2\u003eA Two-Part Flowering Feed for Strong Bloom and Fruit Development\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eThe Source Flo A\u0026amp;B\u003c\/strong\u003e is the two-part base nutrient for the \u003cstrong\u003eflowering and fruiting stage\u003c\/strong\u003e in The Source range, sold as a matched Part A and Part B set. \u003cstrong\u003eFlo A\u003c\/strong\u003e has an NPK of \u003cstrong\u003e5-0-4\u003c\/strong\u003e and \u003cstrong\u003eFlo B\u003c\/strong\u003e an NPK of \u003cstrong\u003e0.5-9-5\u003c\/strong\u003e, giving the phosphorus and potassium plants need for a strong start to bloom and steady progress right through flowering. Both parts carry chelated trace elements (EDTA-chelated manganese, zinc, boron, copper, cobalt and molybdenum), \u003cstrong\u003eamino acids, fulvic acids, natural humic acids, vitamins and sugars\u003c\/strong\u003e and natural stress-relieving agents; Flo A also includes natural plant-extract growth hormones, with no artificial plant growth regulators. The maker says the blend enhances flower and fruit development, oil production and sugar levels while keeping growth robust, in soil, coco or hydro, whatever the hardness of your water.\u003c\/p\u003e\n\u003ch3\u003eKey Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBloom-stage NPK\u003c\/strong\u003e — Flo A \u003cstrong\u003e5-0-4\u003c\/strong\u003e and Flo B \u003cstrong\u003e0.5-9-5\u003c\/strong\u003e, mixed in equal amounts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFruit and flower development\u003c\/strong\u003e — formulated to support flower formation, oil production and sugar levels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChelated trace elements\u003c\/strong\u003e — readily available manganese, zinc, boron, copper, cobalt and molybdenum.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrganic acids built in\u003c\/strong\u003e — amino, fulvic and humic acids, vitamins and sugars in both parts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAny water\u003c\/strong\u003e — performs irrespective of water hardness and pH, in soil, coco and hydro.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesigned for AutoPot\u003c\/strong\u003e — and equally at home in hand-watered, drip, NFT and flood and drain systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eRunning Short of Phosphorus and Potassium in Flower\u003c\/h3\u003e\n\u003cp\u003eWhen plants switch to flowering, their demand shifts towards phosphorus and potassium. A grow feed carried into bloom leaves flowers and fruit short, slow to develop and lacking flavour, while nutrient uptake falls behind the plant's needs. Flo's B part supplies the extra phosphorus and potassium and Flo A keeps nitrogen and potassium available, so plants are fed for structure as well as for fruit and flower development from the first week of bloom.\u003c\/p\u003e\n\u003ch3\u003eHow to Use\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMixing:\u003c\/strong\u003e add \u003cstrong\u003eequal amounts of Part A and Part B\u003c\/strong\u003e to the water, stirring between parts, until you reach your target EC. Measure your plain water first; tap water usually reads between \u003cstrong\u003e0.1 and 0.8 EC\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEC:\u003c\/strong\u003e keep young plants low at about \u003cstrong\u003e1.0–1.4 EC\u003c\/strong\u003e, rising to \u003cstrong\u003e1.7–2.4 EC\u003c\/strong\u003e as they grow, per The Source's guidance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStimulators after:\u003c\/strong\u003e add Origin, Delta, Elements or Alluvium once A and B are in; EC will rise by about 0.4–0.7, which is expected.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSoil and compost:\u003c\/strong\u003e \u003cstrong\u003e1 ml of each part per litre\u003c\/strong\u003e for the first two weeks of flowering, then \u003cstrong\u003e1.5 ml\u003c\/strong\u003e (label range 1–1.5 ml).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoco and hydro:\u003c\/strong\u003e \u003cstrong\u003e1.5 ml of each part per litre\u003c\/strong\u003e (AutoPot chart; label range 1.5–2 ml).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHand watering, drip, NFT and flood and drain:\u003c\/strong\u003e 1 ml of each part for weeks one and two, then 1.5 ml.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGreenhouse crops\u003c\/strong\u003e such as tomatoes and chillies: 1 ml of each part for the first three weeks of flowering, then 1.5 ml to the end of the season.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003epH:\u003c\/strong\u003e set the reservoir to about \u003cstrong\u003epH 5.8\u003c\/strong\u003e for soil and compost and about \u003cstrong\u003epH 5.6\u003c\/strong\u003e for coco or rockwool, as The Source recommends.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"hcs-specs\"\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Two-part base nutrient, flowering and fruiting stage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlo A NPK:\u003c\/strong\u003e 5-0-4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlo B NPK:\u003c\/strong\u003e 0.5-9-5\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlso contains:\u003c\/strong\u003e Amino acids, fulvic acids, natural humic acids, vitamins, sugars, EDTA-chelated manganese, zinc, boron, copper, cobalt, molybdenum and natural stress-relieving agents; Part A adds natural plant-extract growth hormones\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlant growth regulators:\u003c\/strong\u003e No artificial PGRs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDose rate:\u003c\/strong\u003e Soil 1–1.5 ml of each part per litre; coco and hydro 1.5–2 ml of each part per litre\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrowing media:\u003c\/strong\u003e Soil, coco and hydroponics\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater:\u003c\/strong\u003e Suitable for hard and soft water\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupplied as:\u003c\/strong\u003e Matched set of Part A and Part B\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMade in:\u003c\/strong\u003e United Kingdom\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hcs-dosing\" style=\"margin:32px 0 0;border:1px solid #e6e6e6;border-radius:12px;overflow:hidden;font-family:Montserrat,-apple-system,'Segoe UI',sans-serif;\"\u003e\n\u003cdiv style=\"background:#101010;padding:16px 20px;border-bottom:3px solid #efc04c;\"\u003e\n\u003cdiv style=\"color:#ffffff;font-size:17px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;\"\u003eFeed Chart\u003c\/div\u003e\n\u003cdiv style=\"margin-top:6px;color:#b8b8b8;font-size:12px;line-height:1.5;\"\u003eFlo A\u0026amp;B · doses are for EACH of Part A and Part B · flowering and fruiting stage\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;font-size:14px;color:#2b2b2b;background:#fff;\"\u003e\n\u003ctr style=\"background:#f4f4f4;\"\u003e\n\u003cth style=\"text-align:left;padding:10px 20px;font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:#6b6b6b;font-weight:600;\"\u003eStage\u003c\/th\u003e\n\u003cth style=\"text-align:right;padding:10px 14px;font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:#6b6b6b;font-weight:600;white-space:nowrap;\"\u003ePer 1 L\u003c\/th\u003e\n\u003cth style=\"text-align:right;padding:10px 20px;font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:#6b6b6b;font-weight:600;white-space:nowrap;\"\u003ePer 10 L\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:12px 20px;border-top:1px solid #ededed;\"\u003eAutoPot soil and other watering methods, weeks 1–2\u003c\/td\u003e\n\u003ctd style=\"padding:12px 14px;border-top:1px solid #ededed;text-align:right;white-space:nowrap;font-weight:600;\"\u003e1 ml\u003c\/td\u003e\n\u003ctd style=\"padding:12px 20px;border-top:1px solid #ededed;text-align:right;white-space:nowrap;color:#6b6b6b;\"\u003e10 ml\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fcfaf4;\"\u003e\n\u003ctd style=\"padding:12px 20px;border-top:1px solid #ededed;\"\u003eAutoPot soil and other watering methods, week 3 on\u003c\/td\u003e\n\u003ctd style=\"padding:12px 14px;border-top:1px solid #ededed;text-align:right;white-space:nowrap;font-weight:600;\"\u003e1.5 ml\u003c\/td\u003e\n\u003ctd style=\"padding:12px 20px;border-top:1px solid #ededed;text-align:right;white-space:nowrap;color:#6b6b6b;\"\u003e15 ml\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:12px 20px;border-top:1px solid #ededed;\"\u003eCoco and hydro (AutoPot chart)\u003c\/td\u003e\n\u003ctd style=\"padding:12px 14px;border-top:1px solid #ededed;text-align:right;white-space:nowrap;font-weight:600;\"\u003e1.5 ml\u003c\/td\u003e\n\u003ctd style=\"padding:12px 20px;border-top:1px solid #ededed;text-align:right;white-space:nowrap;color:#6b6b6b;\"\u003e15 ml\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fcfaf4;\"\u003e\n\u003ctd style=\"padding:12px 20px;border-top:1px solid #ededed;\"\u003eCoco and hydro, label maximum\u003c\/td\u003e\n\u003ctd style=\"padding:12px 14px;border-top:1px solid #ededed;text-align:right;white-space:nowrap;font-weight:600;\"\u003e2 ml\u003c\/td\u003e\n\u003ctd style=\"padding:12px 20px;border-top:1px solid #ededed;text-align:right;white-space:nowrap;color:#6b6b6b;\"\u003e20 ml\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:12px 20px;border-top:1px solid #ededed;\"\u003eGreenhouse crops, flowering weeks 1–3\u003c\/td\u003e\n\u003ctd style=\"padding:12px 14px;border-top:1px solid #ededed;text-align:right;white-space:nowrap;font-weight:600;\"\u003e1 ml\u003c\/td\u003e\n\u003ctd style=\"padding:12px 20px;border-top:1px solid #ededed;text-align:right;white-space:nowrap;color:#6b6b6b;\"\u003e10 ml\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fcfaf4;\"\u003e\n\u003ctd style=\"padding:12px 20px;border-top:1px solid #ededed;\"\u003eGreenhouse crops, week 4 to end of season\u003c\/td\u003e\n\u003ctd style=\"padding:12px 14px;border-top:1px solid #ededed;text-align:right;white-space:nowrap;font-weight:600;\"\u003e1.5 ml\u003c\/td\u003e\n\u003ctd style=\"padding:12px 20px;border-top:1px solid #ededed;text-align:right;white-space:nowrap;color:#6b6b6b;\"\u003e15 ml\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cdiv style=\"background:#101010;padding:12px 20px;font-size:12px;color:#b8b8b8;line-height:1.6;\"\u003e\n\u003cspan style=\"color:#efc04c;font-weight:600;\"\u003eNote\u003c\/span\u003e — The Source's labels and feed charts (AutoPot, greenhouse and other watering methods); always add equal amounts of A and B. Set EC first, then add any stimulators, then adjust pH.\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cdiv class=\"hcs-faq\"\u003e\n\u003cdetails style=\"border:1px solid #e6e6e6;border-radius:8px;padding:12px 16px;margin:0 0 8px;\"\u003e\u003csummary style=\"cursor:pointer;font-weight:600;\"\u003eWhen do I switch from Gro to Flo?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eWhen the growth stage is complete, ideally not before week two of growth. Greenhouse crops change over at the first sign of flower set.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails style=\"border:1px solid #e6e6e6;border-radius:8px;padding:12px 16px;margin:0 0 8px;\"\u003e\u003csummary style=\"cursor:pointer;font-weight:600;\"\u003eDo I add the same amount of A and B?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eYes. Always add equal amounts of Part A and Part B to the water until you reach your target EC.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails style=\"border:1px solid #e6e6e6;border-radius:8px;padding:12px 16px;margin:0 0 8px;\"\u003e\u003csummary style=\"cursor:pointer;font-weight:600;\"\u003eDo I need a PK booster as well?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eFlo carries the bloom-stage NPK on its own; The Source adds its Alluvium PK Stimulator alongside it on the flowering charts at low rates for extra phosphorus and potassium.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails style=\"border:1px solid #e6e6e6;border-radius:8px;padding:12px 16px;margin:0 0 8px;\"\u003e\u003csummary style=\"cursor:pointer;font-weight:600;\"\u003eWill it work with hard tap water?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eYes. The maker formulated Flo to perform irrespective of water hardness and pH.\u003c\/p\u003e\u003c\/details\u003e\n\u003c\/div\u003e\n\u003ch3\u003eWorks Well With\u003c\/h3\u003e\n\u003cdiv class=\"hcs-related\" style=\"display:flex;flex-wrap:wrap;gap:10px;margin:12px 0 0;\"\u003e\n\u003ca href=\"\/products\/bluelab-nutrient-truncheon\" style=\"flex:1 1 240px;display:flex;align-items:center;gap:12px;padding:10px 12px;border:1px solid #e6e6e6;border-radius:8px;text-decoration:none;color:inherit;background:#fff;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/Bluelab-nutrient-truncheon-card.jpg?v=1746904762\u0026amp;width=160\" alt=\"Bluelab Nutrient Truncheon\" width=\"64\" height=\"64\" loading=\"lazy\" style=\"width:64px;height:64px;object-fit:contain;flex:none;\"\u003e\u003cspan style=\"font-size:14px;line-height:1.4;\"\u003e\u003cstrong style=\"display:block;\"\u003eBluelab Nutrient Truncheon\u003c\/strong\u003e\u003cspan style=\"color:#008d37;\"\u003eDoses A and B to your target EC\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\n\u003ca href=\"\/products\/bluelab-ph-pen\" style=\"flex:1 1 240px;display:flex;align-items:center;gap:12px;padding:10px 12px;border:1px solid #e6e6e6;border-radius:8px;text-decoration:none;color:inherit;background:#fff;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/bluelab-PH-pen-2-medium_landscape.jpg?v=1746904767\u0026amp;width=160\" alt=\"Bluelab pH Pen\" width=\"64\" height=\"64\" loading=\"lazy\" style=\"width:64px;height:64px;object-fit:contain;flex:none;\"\u003e\u003cspan style=\"font-size:14px;line-height:1.4;\"\u003e\u003cstrong style=\"display:block;\"\u003eBluelab pH Pen\u003c\/strong\u003e\u003cspan style=\"color:#008d37;\"\u003eChecks pH once the feed is mixed\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\n\u003ca href=\"\/products\/autopot-system\" style=\"flex:1 1 240px;display:flex;align-items:center;gap:12px;padding:10px 12px;border:1px solid #e6e6e6;border-radius:8px;text-decoration:none;color:inherit;background:#fff;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/autopot-system.jpg?v=1787260281\u0026amp;width=160\" alt=\"AutoPot System\" width=\"64\" height=\"64\" loading=\"lazy\" style=\"width:64px;height:64px;object-fit:contain;flex:none;\"\u003e\u003cspan style=\"font-size:14px;line-height:1.4;\"\u003e\u003cstrong style=\"display:block;\"\u003eAutoPot System\u003c\/strong\u003e\u003cspan style=\"color:#008d37;\"\u003eThe gravity-fed pots Flo was designed for\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\n\u003c\/div\u003e","brand":"The Source","offers":[{"title":"5L (A\u0026B)","offer_id":53931040309514,"sku":"NUT-THES-004-01","price":59.9,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/the-source-flo-a-b-5l-a-b-1.jpg?v=1792294403","url":"https:\/\/hydrocropshop.co.uk\/products\/the-source-flo-a-b","provider":"Hydro Crop Shop","version":"1.0","type":"link"}